Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds genuinely useful context the annotations don't carry: the payload is free-text instructions, and the second sentence constrains how identifiers may be surfaced to the user (names/locales, never UUIDs).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with the core fetch behavior; the second sentence is output-display policy that earns its place because it prevents a user-facing mistake. Slightly long but no filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so the description needn't explain return shape, and it correctly focuses on scope, id sourcing, and display rules. For a simple two-parameter read tool with full annotation and schema coverage, this is essentially complete, with only minor room for explicit sibling disambiguation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3. The description goes beyond the schema by naming the provenance of projectLanguageId (get_project or list_style_guides) and by clarifying the target-language scope, adding real semantic value over the raw property descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (Get) and resource (style guide), and narrows scope to 'one target language of a project' with the returned content ('full free-text translation instructions'). This is clearly distinguishable from sibling list_style_guides and set_style_guide without opening any schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description tells the agent where the required projectLanguageId comes from (get_project or list_style_guides), which is practical routing guidance for invocation. It stops short of an explicit when-to-use-this-vs-list_style_guides statement or any exclusion, so it lands just below the top band.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.